Combined emergency and throttle valve.



J. G. GALLAN & w. JOHNSON. COMBINED EMERGENCY AND THROTTLE VALVE, APPLIGATION FILED FEB. 27, 1998. 927,943; Patented July 13, 1909.

2 SHEETS-SHEET 1,

l5 '7 a l6 O Witnesses; Inventor's,

John-55.?al Ian, er-ner' n r1, 2% W catty J. G. GALLAN & W. JOHNSON. v COMBINED EMERGENCY AND THROTTLE VALVE APPLICATION FILED FEB.Z7,1908. 927,943, Patented July 13, 1909v 2 SHEETS-SHEET f:

Inventors John GCallan,

Wei-her \Jo son, Fig/m UNITED STATES PATENT OFFICE.

JOHN G. OALLAN, OF NAHANT, AND WERNER. JOHNSON, OFLYNN, MASSAGHUSETTS, ASSIGNORS TO GEN ERAL ELECTRIC COMPANY, A CORPORATION OF.NEW YORK.

comamnn nusnenncv AND mmo'rrm... vA Lvu.

To allwhom it may concern:

Be it known that we, JOHN G. CALLAN and WERNER J OHNSON, citizens of the United States, residing at N ahant and L nn, respectively, county of Essex, State of Massachusetts, have invented certain new andv useful Improvements in Combined Emergency and Throttle Valves, of which the following is a specification.

The present inventlon relates to valves for starting and stopplng steam eiigmes which are so constructed and arranged that they may be opened. and closed slowly for normal operation, and closed suddenly when for any the low-speed shaftt from the reason it becomes necessary or desirable.

The object of our invention is to provide a valve of the above mentioned character,

which is simple and. rugged in construction and reliable in operation and requires a minimum amount of attention to keep it in working conditlon.

the accompanying drawings, which illustrate one of the embodiments of the invention, Figure 1 is a partial view in end elevation of a steam turbine fitted with our improved valve; Fig. 2 is an axial sectionof the 'alveggFig. 3 is a detail view partly in cross-section, showing the arrangement of the hooks for 1 indicates the casing of the turbinewhich may be of any desirable construction and 2 is the main shaft therefor. The turbine is controlled by a speed governor 3 drivenb main shaft through speed-reducing gearing.

5 indicates the casing of the valve mechanism and 6 the chest by which steam is admitted to the turbine from the combined emergency and throttle Valve 7. This valve 1s arranged to be opened and closed under normal conditions by the hand-wheel 8, and is closed under emergency conditions by'the weight 9. The weight isnorr'nally held in the position shown by the hooks 10*which are mounted upon the horizontal rock-shaft 11. Mountedon the rock-shaft ll is an arm 12 having a counterweight 1 3,which tends at all timesto move the hooks 1n amanner to release the Weight. Attached to the lower end of the arm 12 is a connecting rod14, the

supporting the weight; and liig. 4 is an enlarged detail view of the up er it to the steam-chest and a end of the valveestem,

made of steel, and

sex-him. 413,039.

lowerend of whichis connected to a lever 15 hav ng a ivot16. The rod 14 is ke t under y-. the counterweight 1 Also.

tension mounted on pivot 16 is an arm 17 which normally engages a stop trigger 18, suitably pivoted at oneside of the main shaft. This tri ger holds the counterweight under norma conditions and prevents it fromfreleasin the main weight.

Mounted upona disk or other driven by the main shaft are two clocksprings 19, each ofwhich forms an emergency overnor for actuating the trigger 18 when he speed becomes abnormally great. The inner end of each spring is. fastened to a support, while the outer end is free, and when the centrifugalforce exceeds a predetermined. amount, due toabnormal, speed conditions, the said free endmoves outward and strikes the trigger, which releases the parts 17, 15, 14, 12, 13 and 10, and permits the main wei ht 9 tofall and close the valve suddenl Tie emergency weight is reset by hand after the valve is closed and the turbine stopped, as will appear hereinafter, as will also the opening of the valve.

Referring more articularly to Figs. 2.to 4, inclusive, 25 indicates the casing of the valve, having suitable flan es for connecting to the supplymam and a horizontally extendingepartition that divides the interior thereof. This partition is bored centrally and afterward removable top of the casing screw-threaded to receive the valve seat 26. Mounted on 'lsa bonnet 27 through which the valve-stem of fluid around the stem 28passes. Leaka e is prevented by the packing and gland 29. The under side of provided 1 with a. bonnet 30 containing apacking and gland 31 toprevent the escape of stem. The stem surrounding it above and below the valve are sleeves non-rustinginaterial, the object of this ing to prevent the parts from stickin due to rust. Mounted on the gland of the ower packing is 'a receptacle or cup 33 that is pfiiped to any convenient 0 any water which; may collect therein. The valve-stein is made in two principal parts, the lower ant being provided with a piston 34which ts into suitable guides tersupport the valve casing is also point for carrying.

Patented Jul 13, 1909.

O fluid around the lower portion of the valvemay with advantage be i 32 made of somef minating at their lower end in an annular space that forms the cylinder part of a. dashpot. Situated above the piston are radial uides 35 that engage and are guided by the ore of the valve seat. The upper end of this portion of the valve-stem is'provided with a screw-thread 36 and a slotted head 37. On said threaded ortion is screwed a removable valve 38 which is rovided with suitable spanner-holes or note es to receive a wrench used in setting up or removing the valve. The slotted portion 37 of the lower part of the stem is arranged to receive the enlargement on the lower end of the upper part of the stem and is so shaped that 0th parts of the stem move longitudinally at all times as a unit, while the upper part can be rotated independently of the lower part.

Mounted on top of the upper bonnet is a frame 39 having an annular .base portion and a tubular upper rtion that is suitably T finished on the outside to form a guide for the main weight andis finished internally to receive'the shdin nut 40 screw-threaded to the valve-stein. he nut 40, prevented by a spline from turning, is norma ly held in the raised or operative position shown by the latch 41, Fig. 4, which isv carried 'bythe spindle or pivot 11. This latch, engages a lip formed on the part42, which is secured to'the nutb prefer to ma e the part 42separate from the nut so that the surfaces engaging the latch 41 can'be hardened to prevent wear, but

this is" not always necessary. -Mounted on the valve-stem 28 is a collar 43 which by en-I gaging the part 42 acts as a stop to. prevent the valve from being'moved upward: to a position within the casinglwhere' it-will'jami and prevent or tend to prevent the valve from operating under'em'ergencyconditions.

Mounted on the upper end of the valve-stem is a'hand-wheel '8-'of any suitable construc tion. This-hand-wheel is keyed to the stem and at all timesmoves' therewith; Under normal conditions the valve may be opened and closed. by rotatin the hand-wheel in one direction 'or-the ot er just the same as j with an ordinary screwvvalvei -When, however, it is desiredjfor any reason to close the I valve suddenly, latch 41 is withdrawn from engagement with the nut 40,;and; after these arts are disengaged hooks. "10 are, moved e right Fig.1) to release the pins 45 attached'to t e main weight 9,

and the latter is permitted to fall. As soon as the weight is released it dro s and thein ternal shoulder 46 strikes t e collar 47 mounted on the valve stem witha hammerblow, due to the lostmotion, and suddenly starts the valve into mot-ion. The collar 47 j is held against axial movement by the shoulder on the stem below it and the collar above. The ends of the collar project through" the side slots in the tubular central a screw or other means. We-

guide or member, and are sufficiently near the walls of the slots to prevent the stem from buckling from any cause. The valve moves more rapidly at the upper end of its stroke than at the lower, because it is unchecked at the start, while the dashot formed by the piston 34 and the cylin er space in the'lower, part of the valve casing cushions its seating. This arrangement is advanta eous because under theseconditions it' is desirable to close the valve as quickly as possible without, however, injuring the seat.

The action of our improved valve is as follows: Assuming that the s eed of the turbine-shaft exceeds the norma by any predetermined amount, as, for example, 10 or 15 per cent, the free ends of the clock" springs reach outward and strike the end shown in dotted lines of the trigger 18. This releases the arm 17, lever 15 and the counter-weight 13 swings the latch 41' and hooks lO to the right. The latch 41 is so adjusted with respectto the hooks 10 that hold the weight thatit disengages the nut before the hooks 10 release the" weight. As

operation and that it is desired to reset the same, the hand-wheel 8' is rotated to the right, (the closing movement under normal conditions). Since the valve is seated and the stem 28 isprevented from moving downward, it follows that the rotation of the hand wheel and stem as specified will cause the nut 40' to move upward on the stem until it strikesthe projection or shoulder 49 on the frame 39; the said'shoulder acting as a stop-"to prevent further movement. The nextst 'islto-niove the weight 9 up into the pos1ti'onshown in the figures b hand and cause the hooks" 1O to'engage t e pins 45. It willbe observed that the hooks are provided with flat inclined surfaces or cams 52 so that asthe weight'is moved upward to about its normal position they will be struck by the pins 45 on the weight and forcibly swing the lower parts of the hooks under the pins and about the rock-shaftll asa center. "This action also moves the latch 41 into place, and through the rod 14 the part 17 of the emergency governingmechanism is moved to its normal position.

The weight .is then lowered slightly until it rests on the hooks. The trigger 18 is so arranged that it will automatically return -to place and lock the parts when the hook soon as the weight falls it'imparts a ham- 'mer-blow to the valve and closes it. Assumj ing the valve to be closed after an emergency 10,latch 41, rod 14 and arm 17 are reset or returned to their normal positions. This action may be brought about b any suitable means, as for example b ma ting the lefthand end of the trigger slightly heavier than the other end. This arrangement .isparticularly desirable since the attendant can sli htly it might injure the same.

use both hands to reset the weight and at the same time avoid having to set the hooks by a separate operation. The third and last step in the operation consists in turning the hand-wheel to the left, (the direction opposite to that required to reset the nut) and the valve will open the same as any ordinar throttle valve of the nut and screw type. f it be desired to shut down the turbine b hand it is onlynecessary to r0- tate the and-wheel in a direction to close the valve, all the other parts remaining in the position shown inthe drawings.

In order to'simplify and cheapen the valve, the weight 9 iscast in onepiece with slots 50 arranged diametrically opposite, which very greatly weaken the met at these points. fter the weight is bored and the central portion of its periphery finished, it is broken in halves in line with the slots. The weight can then bemounted in place around the guide carried by the upper valve bonnet, after which a ring or band 51 is shrunk on the outside. The adjacent surfaces of the fracture will be sufiicientl rou h to prevent one part from moving in epen ently of the other. I

Care should be exercised to seethat the latch lets goof the nut before the hooks release the wei ht, since otherwise the weight would be unable to close the valve, or if the impact was suflicient to move the f latch ur improved valve possesses many advantages in the way of simplicity and decreased cost of construction. It is very compact and the parts are all simple and rugged in character and ofakind not liable to get out of order. By using atubular ide it can be very readily machined an by mountin it centrally with the nut inside and the weig t outside, one guide serves for two purposes; and since the guide can be rigidly cited to the casing, there is no danger of the arts 'gettin out of line. -By making the ower end 0 the stem larger than the upper,

it has a self-closing tendency, which is elpful in closing the valve, articularly under emergency conditions. wing to the construction and arrangement of the parts, the valve may be freely opened and closed by hand, without regard to the emergency tripping mechanism, and the latter will operate the valve suddenl even though the engineer be in the act of c osing or opening the valve by the hand-wheel.

The valve may be closed manually through i the medium of the weight by raising the arm 12, which is connected to the latch 41, and the hooks 10, althou h this ordinarily would not be found desirab e, because. it necessitates the resetting of the arts. i

It is preferable, but not essential, in all cases that the valve shall have a self-closing tendency. This will depend largely upon the closi but we desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means. v

What weclaim as new,and desire to secure by Letters Patent of the United States, is, I

i 1. In combination, a va1ve,a casing therefor, a screw-threaded stem for the valve a sliding nut, a handle forthe stem, a central member within whichthe nut is guided, a means for supporting the nut, a weight that surrounds the member and is guided thereby,

and a device for releasing said means;

2. In combination, a valve having a selfclosin tendency, a casing therefor, a screwand closing the valve, a handle for the stem,

a centralmemberthat guides the nut after it is released, a means carried'by said member which engages and norma 1y supports the nut, a device for releasing the means and permitting the valve to close, and a weight which surrounds and. is guided by said member for assisting the valve to close.

a 3. Incombination, a valve having a self-'1 threa ed stem and nut it or normallyopen-fi ing and closingthe valve, a handle for the stem, a central member that guides the nut after it is released, a hook carried said member which directly en an normally su ports the nut, a evice forTreleas ing the, ook and permitting the valve to close, and a weight which assists in closing the valve and is guided in its descent by sai member.

4, In combination, a valve, athreaded v stem and sliding nut for opening and closin the valve under normal conditions, a late that supports the nut, a suspended Wei ht which closes the valve when it falls, an a threa ed stem and nut for normallyopening tendency,'a casin therefor, a screwits means which first withdraw s the latch and thereafter releases the wei ht.

. 5, In combination, a va ve,a threaded stem and sliding nutfor opening and clos ing the valve under normal conditi a latch that sup cite the nut, a. sus ed weight which 0 oses the valve when it falls, a hook for sustainin the weight, and a means which first withdraws the latch and thereafter the said hook.

6. In combination, a valve havin a selfclosing tendency, a threaded stem erefor, an actuator for the stem a sliding nut through which the stem extends, a. stop which engages the nut and limits its movement in one direction, a handle for actuating the valve through its stem, a device for rewhich the stem passes, a tubular guide mounted on the casing within which the nut slides, a weight which surrounds the ide and whose movements are directed t ereby, and means which normally sup ort both the nut and the weight and'release t em one after the other in closing thevalve.

8. In combination, a valve, a -casing therefor, a screw-threaded stem for the valve, a sliding nut through which the stem passes, a handle for the stem, a centralguidin member mounted on the casing within WhlCll, the

' nut slides, a stop to limit the travel of the i the nut in one direction, a stop on the stem for limiting its travel in one direct1on,.a latch ,for supporting the nut, and a means for re leasing the latch when it is desired to close the valve suddenly.

9. In combination, a valve, a casing therefor, a screw-threaded stem for the valve, a sliding nut through which the stem passes, a tubular uide mounted on the casing within which t e nut slides, a sto in the bore of the guide to limit the trave of the nut, a stop on the stem for limiting its movement within the nut, a weight which surrounds ide and whose movements are directed thereb a latch for supporting the nut, a hook or supporting the weight, and a connection between the latch and hook which insures the former acting before the latter.

10.,In combination, a valve, a casing therefor, bonnets closing the ends thereof, a tubular member mounted on one of the bonnets, a-threaded stem which extends through both bonnets and into the bore of said member, one portion of the stem beinglarger than the other to give the valve a self-closing tendency, a nut mounted on the stem and arranged to slide without turning in the said member, a pivoted latch carried by the mem ber' which normally directly engages and sustains the nut, and a means for releasing the latch.

11. In combination, a valve, a screwthreaded stem, a sliding nut which engages the stem, a collar on the stem, a suspended weight which when it falls strikes the collar and closes the valve, a latch for sustaining the nut in its normal position, a means for sustaining the weight, and a connection for operating the latch and means successivel 12. In combinatioma valve,a screw-thread ed stem, a sliding nut which engages the stem, atubular uiding member for the nut, a suspended weight that is also guided by themember, a collar on the stem which projects through the walls of the member and is guided thereby to prevent the stem from buckling and which is struck by the falling weight, a latch for normally sustaining the .and' closing the valve under normal conditions, a latch that supports the nut and through it the valve when the latter is moved by the stem and handle, a motor for closing the valve suddenly when released, a means forrestraining the motor from acting, and emergency mechanism which first moves the latch in a direction to release the nut and thereafter inoves said means in a direction to release the motor.

15. In combination, a support, a weight, a

device carried by the support for sustaining the weight, a means actuated by theweight as it is raised for moving the device into a position to receive and sustain said weight, and an agent which vis actuated by the weight as it falls. v

16. In combination, a support, a weight, a hook carried by the support forsustamin the weight, a means carried by the hook an actuated by theweight as it is lifted for,

moving the hook into a position to receive and sustain the'weight when it is slightly lowered, and an agent which is actuated by the falling weight.

In witness whereof, we have hereunto set our hands this 24th day of February, 1908.

JOHN G. OALLAN.

WERNER JOHNSON. Witnesses JOHN A. MCMANUS, Jr., HENRY O. lVEs'rENDARP. 

